/*
 *
 * This file is part of Aiphial.
 *
 * Copyright (c) 2010 Nicolay Mitropolsky <NicolayMitropolsky@gmail.com>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 2 of the License, or
 * (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

package me.uits.aiphial.general.datagenerator;

import java.util.ArrayList;
import java.util.List;
import java.util.Random;

import me.uits.aiphial.general.dataStore.NDimPoint;
import me.uits.aiphial.general.dataStore.SimpleNDimPoint;

/**
 * N-dim points data generator based on multiple Gaussian distribution.
 *
 * @author Nicolay Mitropolsky <NicolayMitropolsky@gmail.com>
 */
public class DataGenerator {
    private int deviation = 40;

    private int dim = 5;
    private int maxValue = 100;

    private Random r = new Random();

    private NDimPoint mapCenter;

    public List<NDimPoint> generate(int centers, int totalPoints) {

        if (mapCenter == null)
            mapCenter = SimpleNDimPoint.getZeroPoint(dim);

        List<NDimPoint> result = new ArrayList<NDimPoint>(totalPoints);

        int pointsPerCenter = totalPoints / centers;

        for (int i = 0; i < centers; i++) {
            NDimPoint center = genCenter();
            result.add(center);

            for (int j = 0; j < pointsPerCenter; j++) {

                result.add(genPoint(center));

            }
        }

        return result;
    }

    private NDimPoint genPoint(NDimPoint center) {

        Float[] data = new Float[dim];

        for (int i = 0; i < dim; i++) {
            data[i] = (float) (center.getCoord(i) + r.nextGaussian() * deviation);
        }

        return new SimpleNDimPoint(data);
    }


    private NDimPoint genCenter() {
        Float[] data = new Float[dim];

        for (int i = 0; i < data.length; i++) {
            data[i] = mapCenter.getCoord(i) + (float) (r.nextDouble() * maxValue);
        }

        return new SimpleNDimPoint(data);
    }

    public DataGenerator() {
    }

    public DataGenerator(int dim) {
        this.dim = dim;
    }

    public int getDim() {
        return dim;
    }

    public void setDim(int dim) {
        this.dim = dim;
    }

    public int getDeviation() {
        return deviation;
    }

    public void setDeviation(int deviation) {
        this.deviation = deviation;
    }

    public void setMaxValue(int maxValue) {
        this.maxValue = maxValue;
    }

    public int getMaxValue() {
        return maxValue;
    }


    public NDimPoint getMapCenter() {
        return mapCenter;
    }

    public void setMapCenter(NDimPoint mapCenter) {
        this.mapCenter = mapCenter;
    }
}
